Book/Report FZJ-2018-03122

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Elektronische und magnetische Struktur von Eisen- und Kobalt- Schichten im Monolagenbereich mittels spinpolarisierter Photoemission mit Undulatorstrahlun



1989
Kernforschungsanlage Jülich, Verlag Jülich

Jülich : Kernforschungsanlage Jülich, Verlag, Berichte der Kernforschungsanlage Jülich 2283, 121 p. ()

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Report No.: Juel-2283

Abstract: A complex multipol-magnet structure (undulator/wiggler) has been built d characterized as a new synchrotron radiation source for the electron storage ring BESSY in Berlin. Optimization of the magnet structure and a first optical characterization of the radiation properties of this novel light source including beamline have been presented. The photon flux reaches up to 10$^{14}$ photons per second and Ampere ring current over a spectral range from 20 to 500 eV with as well increasedbrightness and exceeds the radiation power of the BESSY dipol-magnets by approximately two orders of magnitude. As a second important result, the spin-split electronic band structure of a ferromagnetic monolayer of Fe and Co on Au(001) has been measured directly for the first time, using spin-, energy-, and angle-resolvedphotoemission spectroscopy. The spectra differ clearly from those of thicker layers because of a 3d-band narrowing and show no dispersion with k$_{\bot}$ in agreement with the two-dimensionality of monolayer films. In general agreement with theoretical predictions, a slight dispersion with k$_{\vert \vert}$ is observed, whereas the measured exchange splitting of 2.3 eV is about 0.6 eV smaller than predicted.


Contributing Institute(s):
  1. Publikationen vor 2000 (PRE-2000)
Research Program(s):
  1. 899 - ohne Topic (POF3-899) (POF3-899)

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 Record created 2018-05-22, last modified 2021-01-29